PA4000 Power Module is dual-channel power supply for condenser microphone and preamplifier, which is for general use in acoustic vibration measurements, PA4000 also has dual- channel  power amplifier for loudspeaker or other sound source.

It provides function as follows:

Ÿ     ◆   Power voltage for two condenser microphones

Ÿ     ◆   A voltage supply for powering up to two preamplifiers

Ÿ     ◆   Signal amplifier for driving loudspeaker and other sound source

Ÿ     ◆   The gain of each channel can be set independently

The compact integration of Microphone Power Supply and Power Amplifier satisfy most electro-acoustic testing requirement.

a) front panel

b) back panel

Fig.1 PA4000 Power Amplifier

The power amplifier channel has 0dB,5dB and 15dB adjustable gain, user can adjust/select from front panel.

The microphone channels provide constant current source to the ICP condenser microphone from 10Hz to 50kHz in frequency.The microphone signal amplifier ensures good linearity with minimum noise and distortion.

Features

    ◆   Two channels input and output

    ◆   Selectable gain for each channel

    ◆   Overload protection circuitry

    ◆   Power supply 220V

Uses

    ◆   Driver for loudspeaker, receiver, artificial mouth, etc

    ◆   Power amplifier for audio and vibration analyzer

    ◆   General-purpose audio power amplifier

    ◆   The current source for ICP capacitor microphone

Characteristic Curve

Frequency response：20Hz-100kHz:

THD+N vs power (0-25watt):

The power amplifier specifications

◆   Frequency response              (20Hz-100 kHz/1w)±0.5dB

◆   Phase response                  (20Hz-100 kHz/1w)   +15°to -20°

◆   SNR                             (20Hz-100 kHz/1w)          90dB A-weighted

◆   THD/1w                           <0.1%

◆   Channel Separation               80 dB

◆   Gain control                     0dB - 25dB

◆   Continuous Output Power          25W（4ohm load）

◆   Max output voltage               11V

◆   Input Impedance                  18kohm

◆   Output Impedance                 <5ohm

◆   Power supply                      AC220V/110V

◆   Dimension                         310mm*147mm*51mm

◆   Weight                            2.5Kg

The microphone supply power specifications

◆   Input Channels                     BNC socket

◆   Output Channels                    BNC socket

◆   Input Impedance                    100kohm

◆   Output Impedance                   <30ohm

◆   Frequency response                 10Hz-50kHz（±0.5dB）

◆   Channel Separation                 60dB(20Hz-20kHz)

◆   Noise                              <-100dBV

◆   Power Supply                        AC220V